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Sarcolemma
name given to the plasma membrane of a muscle cell
T-tubule
inward extensions of the sarcolemma that allow impulses to go deeper into the cell
Irritability
the ability of a muscle cell to be stimulated or excited
Motor unit
a neuron and all the muscle fibers it stimulates
Tropomyosin
protein that blocks the receptor sites on the actin molecule
Contractility
the ability of a muscle cell to shorten
Actin
bead-like globular protein that makes up the thin myofilament
Troponin
protein that joins with calcium ions to allow cross-bridges to form
Extensibility
the ability of a muscle to stretch
Myosin
protein that looks like “bundled golf clubs” that makes up the thick myofilament
Sarcomere
a segment of the myofilament between two Z-lines